AfterStep is a Window Manager for X which started by emulating the NeXTSTEP look and feel, but which has been significantly altered according to the requests of various users. Many adepts will tell you that NeXTSTEP is not only the most visually pleasant interface, but also one of the most functional and intuitive out there. AfterStep aims to incorporate the advantages of the NeXTSTEP interface, and add additional useful features.
wmnet polls network statistics and does a few things with the data it gets. It has small blinking lights for the rx and tx of ip packets, a digital speedometer of your tcp/ip stack's current speed and neatest of all, a bar graph like xload et. al which has a tx speed graph from bottom-up and rx speed graph from the top-down. The speedometer keeps track of the current speed per second and shows it in a color corresponding to which of rx or tx that has the highest speed at the moment.
Enlightenment is a themeable, fast, flexible, and powerful window manager that is designed to be as configurable as possible in both look and feel. In addition, Enlightenment provides an applet API that provides functionality somewhere between the GNOME applet system and Dock Apps from Afterstep/WindowMaker. The current design aim is for Enlightenment to become a desktop shell.
Window Maker is an X11 window manager designed to give additional integration support to the GNUstep Desktop Environment. In every way possible, it reproduces the elegant look and feel of the NeXTSTEP[tm] GUI. It is fast, feature rich, easy to configure, and easy to use. In addition, Window Maker works with GNOME and KDE, making it one of the most useful and universal window managers available.